Love them or hate them, spiders are all around us. There are around 50,000 species of spiders in the world, and more than 3,500 of them are in the United States. Spiders can be various sizes, from ...

Spiders from the Uloboridae family, usually just a few millimeters long, have puzzled scientists because they seemed to lack venom—a substance that is widespread among spiders and “really linked to ...